X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/728e5a2f1ed16e2cfe0ca5586edac6c10da436c5..23a00f051576d2e7edd18b6af382902cc34ea4a2:/black.py

diff --git a/black.py b/black.py
index 2783a10..35af598 100644
--- a/black.py
+++ b/black.py
@@ -607,6 +607,9 @@ def decode_bytes(src: bytes) -> Tuple[FileContent, Encoding, NewLine]:
     """
     srcbuf = io.BytesIO(src)
     encoding, lines = tokenize.detect_encoding(srcbuf.readline)
+    if not lines:
+        return "", encoding, "\n"
+
     newline = "\r\n" if b"\r\n" == lines[0][-2:] else "\n"
     srcbuf.seek(0)
     with io.TextIOWrapper(srcbuf, encoding) as tiow:
@@ -623,7 +626,7 @@ GRAMMARS = [
 def lib2to3_parse(src_txt: str) -> Node:
     """Given a string with source, return the lib2to3 Node."""
     grammar = pygram.python_grammar_no_print_statement
-    if src_txt[-1] != "\n":
+    if src_txt[-1:] != "\n":
         src_txt += "\n"
     for grammar in GRAMMARS:
         drv = driver.Driver(grammar, pytree.convert)
@@ -768,6 +771,7 @@ UNPACKING_PARENTS = {
     syms.dictsetmaker,
     syms.listmaker,
     syms.testlist_gexp,
+    syms.testlist_star_expr,
 }
 TEST_DESCENDANTS = {
     syms.test,
@@ -2209,11 +2213,14 @@ def right_hand_split(
             result.append(leaf, preformatted=True)
             for comment_after in line.comments_after(leaf):
                 result.append(comment_after, preformatted=True)
-    bracket_split_succeeded_or_raise(head, body, tail)
     assert opening_bracket and closing_bracket
+    body.should_explode = should_explode(body, opening_bracket)
+    bracket_split_succeeded_or_raise(head, body, tail)
     if (
+        # the body shouldn't be exploded
+        not body.should_explode
         # the opening bracket is an optional paren
-        opening_bracket.type == token.LPAR
+        and opening_bracket.type == token.LPAR
         and not opening_bracket.value
         # the closing bracket is an optional paren
         and closing_bracket.type == token.RPAR
@@ -2230,11 +2237,15 @@ def right_hand_split(
                 yield from right_hand_split(line, line_length, py36=py36, omit=omit)
                 return
             except CannotSplit:
-                pass
+                if len(body.leaves) == 1 and not is_line_short_enough(
+                    body, line_length=line_length
+                ):
+                    raise CannotSplit(
+                        "Splitting failed, body is still too long and can't be split."
+                    )
 
     ensure_visible(opening_bracket)
     ensure_visible(closing_bracket)
-    body.should_explode = should_explode(body, opening_bracket)
     for result in (head, body, tail):
         if result:
             yield result